Kurum Yazarı "Ayas, Erhan" Makale Koleksiyonu İçin Listeleme
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An alternative composite approach to tailor the thermoelectric performance in SiAlON and SiC
Kaya, Pınar; Gregori, Giuliano; Yordanov, Petar; Ayas, Erhan; Habermeier, Hanns-Ulrich; Maier, Joachim; Turan, Servet (Elsevier Sci LTD, 2017)The thermoelectric properties of SiAlON and SiC based composites prepared by adding TiCN (5 and 10 vol.%) as a particulate or as a segregated three-dimensional network were investigated. Although the volume fraction of the ... -
Analytical transmission electron microscopy observations on the stability of TiCN in electrically conductive alpha-beta SiAlON/TiCN composites
Yurdakul, Hilmi; Turan, Servet; Ayas, Erhan; Tunckan, Orkun; Kara, Alpagut (Elsevier Sci LTD, 2014)Coating of alpha-beta SiAlON granules with TiCN powder led to a continuous 3D electrically conductive network formation. Here, the stability of TiCN grains following gas pressure sintering (GPS) and its effect on the ... -
Decolouration effect of WC addition on gas pressure sintered alpha-beta SiAlON ceramics
Ayas, Erhan; Kara, Alpagut; Mandal, Hasan; Turan, Servet; Kara, Ferhat (Elsevier Science BV, 2004)In this study, an attempt was made to mask an inhomogeneous gray colouration featured on the surfaces of the gas pressure sintered alpha-beta SiAlON ceramics containing 50% alpha and 50% beta SiAlONs in the form of spots. ... -
Densification and properties of in-situ synthesized ZrB2-SiC composities from ZrO2, B4C and SiC system
Gürcan, Kübra; Yılmaz, Burcu; Ayas, Erhan (Korean Assoc Crystal Growth, Inc, 2017)Zirconium diboride-silicon carbide (ZrB2-SiC) ceramics were in-situ synthesized and densified by the spark plasma sintering (SPS) method using ZrO2, B4C and SiC as starting powders. Both synthesis and densification processes ... -
Fabrication and microstructural stability of spark plasma sintered Al2O3/Er3Al5O12 eutectic
Özerdem, Ece; Ayas, Erhan (Elsevier Sci LTD, 2015)Al2O3-Er3Al5O12 (BAG) eutectic was prepared by a arc melting process under Ar atmosphere. Button shaped melts, containing fine sized irregular eutectic structures of 'Chinese script', with interpenetrated Al2O3 and EAG ... -
Fabrication of in situ Ni(W)-WC nano composites via mechanical alloying and spark plasma sintering
Genç, A.; Ayas, Erhan; Öveçoğlu, M. L.; Turan, Servet. (2012)Microstructural and mechanical properties of spark plasma sintered Ni-30 wt% W powders fabricated via mechanical alloying (MA) for 48 h were reported in the present study. Due to the intensive WC contamination during MA, ... -
In-situ synthesis and densification of HfB2 ceramics by the spark plasma sintering technique
Gürcan, Kara; Ayas, Erhan (Elsevier Sci LTD, 2017)Hafnium diboride (HfB2) ceramics were in-situ synthesized and densified by the spark plasma sintering (SPS) method using HfO2 and amorphous boron (B) as starting powders. Both synthesis and densification processes were ... -
Magnetic MCM-41 silica particles grafted with poly(glycidylmethacrylate) brush: Modification and application for removal of direct dyes
Arıca, Tugce A.; Ayas, Erhan; Arıca, M. Yakup (Elsevier Science BV, 2017)Magnetic MCM-41composite particles were prepared and modified with (3-aminopropyl) triethoxysilane (APTES), then grafted with poly(glycidyl methacrylate) p(GMA) by surface-initiated atom transfer radical polymerization ... -
MECHANICAL, ELECTRICAL AND THERMAL PROPERTIES OF ?/? SiAlON-SiC COMPOSITES FABRICATED BY GAS PRESSURE SINTERING METHOD
Ayas, Erhan (2016)?/? SiAlON-SiC composites were produced by coating SiAlON based spray dried granules with varying amounts of SiC (0-10 vol % SiC) following gas pressure sintering technique. A two step sintering schedule between 1940-1990°C ... -
Microstructural evolution of mechanically alloyed and spark plasma sintered Ni-W alloy matrix composites
Genç, A.; Kaya, P.; Ayas, Erhan; Öveçoğlu, M. L.; Turan, Servet. (2013)Microstructural evolution of Ni(W) solid solution alloys fabricated via mechanical alloying (MA) of Ni - 30 wt.% W powders and spark plasma sintering (SPS) at 1000 C for 3 min were presented in this study. Due to contaminations ... -
A novel approach for preparing electrically conductive alpha/beta SiAlON-TiN composites by spark plasma sintering
Ayas, Erhan; Kara, Alpagut; Kara, Ferhat (Ceramic Soc Japan-Nippon Seramikkusu Kyokai, 2008)An effective approach for preparing electrically conductive SiAlON-TiN composites have been developed. Granules of a designed composition of alpha-beta SiAlON were obtained by spray drying and coated with varying amounts ... -
A novel approach for synthesis of monticellite based bioactive ceramic powders from boron derivative waste
Köroğlu, Levent; Butev, Ezgi; Esen, Ziya; Ayas, Erhan (Elsevier Science BV, 2017)Monticellite bioactive ceramics have a high usage potential as bone graft substitutes due to their superior mechanical properties compared to hydroxyapatite and excellent bioactivity. Turkey has almost 72% of the global ... -
Novel electrically conductive alpha-beta SiAlON/TiCN composites
Ayas, Erhan; Kara, Alpagut (Elsevier Sci LTD, 2011)Electrically conductive alpha-beta SiAlON/TiCN composites were produced in the form of a segregated network in a ceramic matrix structure. A continuous 3D network of conductive TiCN particles was successfully achieved by ... -
Oxidation behavior of electrically conductive alpha/beta SiAlON composites with segregated network of TiCN
Çelik, Ali; Ayas, Erhan; Halil, Etem; Kara, Alpagut (Elsevier Sci LTD, 2012)The oxidation behavior of novel electrically conductive alpha/beta SiAlON composites with a continuous network of 2.5-10 vol% TiCN particulates was investigated. Composites, produced by coating spray dried granules with ... -
Sintering of 94Na(0.5)Bi(0.5)TiO(3)-6BaTiO(3) with SPS and conventional methods for crystal growth
Gürbüz, Mevlüt; Ayas, Erhan; Doğan, Aydın (Korean Assoc Crystal Growth, Inc, 2016)In this study, lead-free 94Na(0.5)Bi(0.5)TiO(3)-6BaTiO(3) (94NBT-6BT) piezoelectric ceramics and embedded single crystals in polycrystalline 94NBT-6BT matrix were sintered by conventional (CS) and spark plasma sintering ... -
Sintering of 94Na0.5Bi0.5TiO3-6BaTiO3 with SPS and conventional methods for crystal growth
Gürbüz, Mevlüt; Ayas, Erhan; Doğan, A. (Hanyang University, 2016)In this study, lead-free 94Na0.5Bi0.5TiO3-6BaTiO3 (94NBT-6BT) piezoelectric ceramics and embedded single crystals in polycrystalline 94NBT-6BT matrix were sintered by conventional (CS) and spark plasma sintering (SPS) ... -
Size evolution of nanomagnetic particles and magnetotransport properties of (Co 90Fe 10) 20Ag 80 nanogranular films: Influence of Cu 80Ag 15Au 5 underlayer
The influence of (Co 90Fe 10) 20Ag 80 film thickness and of Cu 80Ag 15Au 5 underlayer on nanomagnetic, magnetotransport and structural properties of (Co 90Fe 10) 20Ag 80 nanogranular films prepared by ultra-high vacuum ion ...